Description This 50ml glass bottle of Kaweco Royal Blue fountain pen ink is a bright, rich shade of blue ink can be used in any fountain pen that uses a converter. Kaweco inks were created by experts trained in the specialty niche of ink chemistry, and fountain pen users who prefer the expressive flow of a fountain pen will really appreciate this superior ink. Having trouble deciding between colors? Use our Ink Comparison Tool to quickly and easily view different colors side by side. We offer Free Shipping on all orders over $59 for US customers, and for orders over $250 for our Canadian customers.